Ah thanks. I had read about a lot of evidence pointing in the USA's direction, but didn't realize Snowden also confirmed it. Arguably still hearsay, but certainly adds more weight to it.
In addition to the Snowden confirmation, there were some press leaks in 2012 that appear to have confirmed it earlier [1]. Apparently there's still some investigations going on within the U.S. government about who leaked it.
I'd say it's a pretty clear-cut case who was behind Stuxnet.
